QuickBooks, even though regarded as one of the best accounting software can sometimes fail to respond and completely crashes in between. The desktop software was not installed properly or have some corrupt data files or either an anti-virus software is causing this error. You can try the given solution to get rid of this error and if required you may get in touch with the quickbooks customer support and avail the solution given by them:
• Reboot the system
• Disable any anti-virus software that has been installed in the system
• Open the QuickBooks Desktop software to see whether the issue stands resolved
• Install QB Diagnostic Tool in the system to look for and resolve the errors.

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QuickBooks error 1603 generally occurs when there has been an issue in the update process of the QB software and the update installer might have encountered internal damage. The resolution for this issue can be achieved when you reinstall the QBDT extension file in the windows after uninstalling it. To continue with the process, just take a look at these given steps:
• Press Windows and R key together to open the dialog box for giving the run command
• Go to control panel> Programs and Features>QuickBooks>Uninstall
• Download the QB clean extension tool and reinstall QuickBooks using this tool.
If the given suggestion doesn’t come out as effective, then you must not waste even a single moment and get in touch with the Quickbooks customer care and take the certified help.

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